Urine composition is complex, but includes ions, _____ from catabolism of amino acids, _____ from catabolism of dietary nucleic acids and RNA, _____ from decomposition of creatine in the muscles and the yellow _____ from heme breakdown.

3000+ review questions on anatomy and physiology. 

Anatomy refers to the internal and external structures of the body and their physical relationships, whereas physiology refers to the study of the functions of those structures.